firebase router

firebase router

You need to make sure the rewrites are enabled in your Firebase hosting configuration to redirect all requests to your index.html file. This assumes you are using create-react-app:
```
{
  "hosting": {
    "public": "build",
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ],
    "rewrites": [
      {
        "source": "**",
        "destination": "/index.html"
      }
    ],
    "headers": [
      {"source": "/service-worker.js", "headers": [{"key": "Cache-Control", "value": "no-cache"}]}
    ]
  }
}
```